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NS_E_BKGDOWNLOAD_INVALID_FILE_NAME
Diagnostic meaning beyond the standard message
The actionable meaning of 0xC00D126B / NS_E_BKGDOWNLOAD_INVALID_FILE_NAME is deriving a valid final filename for the requested download. Keep the object generation and lower-level result attached to the NS_E_BKGDOWNLOAD_INVALID_FILE_NAME event.
Why the operation can reach this point
At the NS_E_BKGDOWNLOAD_INVALID_FILE_NAME checkpoint, the Player’s download manager coordinates an owner window, a plug-in, background job identity, temporary files and final completion or cancellation; A downloaded .wmd package adds an extraction and cataloguing phase after transfer. The page-specific boundary is deriving a valid final filename for the requested download.
For NS_E_BKGDOWNLOAD_INVALID_FILE_NAME, receiving all network bytes is not the same as completing the job, moving the temporary file or successfully unpacking and cataloguing a Windows Media Download package. One concrete reproduction is: the server-supplied title expands to an empty or invalid Windows filename.
Evidence matrix
| Evidence | Why it matters for invalid file name |
|---|---|
| Producing object and operation | job GUID and Player signature, BITS/job state, expected and actual file count, remote and local names, temporary path, completion/cancel request, plug-in and callback identity, COM apartment, WMD extraction result and first underlying HRESULT |
| Decisive observation | remote URL, content metadata, proposed local name, path rules and destination |
| Generation identity | Record the same disc, device, job or Player operation generation that returned NS_E_BKGDOWNLOAD_INVALID_FILE_NAME; a reconnect or media change creates a different test. |
| Underlying result | Keep the first device, filesystem, COM, codec, DirectShow, IMAPI or BITS result seen before the Player mapped it to NS_E_BKGDOWNLOAD_INVALID_FILE_NAME. |
| Controlled comparison | Repeat the producing call after changing only this condition: sanitize or supply a legal unique local filename before creating the file entry. |
Decision matrix
| Observation | Interpretation |
|---|---|
| The recorded values match the boundary | The result is consistent with deriving a valid final filename for the requested download; correct that state before changing unrelated codecs, drivers or playlists. |
A lower layer failed before NS_E_BKGDOWNLOAD_INVALID_FILE_NAME | Preserve that earlier HRESULT or device result because NS_E_BKGDOWNLOAD_INVALID_FILE_NAME may be only the Player-level mapping. |
| The same call passes after one isolated change | The comparison supports the invalid file name diagnosis rather than a broad installation failure. |
The code changes after retesting NS_E_BKGDOWNLOAD_INVALID_FILE_NAME | The NS_E_BKGDOWNLOAD_INVALID_FILE_NAME boundary was passed; diagnose the new HRESULT as the next independent stage. |
NS_E_BKGDOWNLOAD_INVALID_FILE_NAME scopes the failure to deriving a valid final filename for the requested download. The presence of NS_E_BKGDOWNLOAD_INVALID_FILE_NAME does not establish a system-wide media failure; verify its owning operation before changing unrelated Player components.
Minimal experiment
- Capture
0xC00D126B,NS_E_BKGDOWNLOAD_INVALID_FILE_NAME, the exact Player/API operation and the first timestamp at which it appears. - Save remote URL, content metadata, proposed local name, path rules and destination; do this before ejecting media, reconnecting a device, canceling a job or rebuilding the Player object.
- For
NS_E_BKGDOWNLOAD_INVALID_FILE_NAME, correlate the result with job GUID and Player signature, BITS/job state, expected and actual file count, remote and local names, temporary path, completion/cancel request, plug-in and callback identity, COM apartment, WMD extraction result and first underlying HRESULT. - Reproduce once with the original source and destination, then apply only this change: sanitize or supply a legal unique local filename before creating the file entry.
- Create a fresh operation generation and verify that the original call advances beyond the invalid file name boundary.
Do not collapse it with these results
| Related result | Different diagnostic boundary |
|---|---|
NS_E_IMAGE_DOWNLOAD_FAILED | downloading or committing an image resource used by the Player or content service |
NS_E_INTERFACE_NOT_REGISTERED_IN_GIT | retrieving a COM interface from the Global Interface Table in another apartment |
NS_E_BKGDOWNLOAD_FAILEDINITIALIZE | starting the overall background-download manager and job database |
Recovery and verification
Resolve the responsible precondition by ensuring that you sanitize or supply a legal unique local filename before creating the file entry. A successful retest must pass the same invalid file name checkpoint, not merely hide the message in a different UI path.
When verifying NS_E_BKGDOWNLOAD_INVALID_FILE_NAME, do not delete the job or temporary file before recording its state, owner signature and file list; Completion and cancellation are terminal operations and must not be retried blindly.
Authoritative documentation
- BITS interfaces and job objects.
- Completing and canceling a BITS job.
- BITS return values and job-state failures.
- Windows Media Download packages.
- Creating the COM Global Interface Table.
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